package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect// 切面
@Component // 组件
@Slf4j// 日志
public class AutoFillAspect {
    /*
    *切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}


    @Before("autoFillPointCut()")// 前置通知
    public void autoFill(JoinPoint joinPoint){
        //joinPoint: 获取到被拦截的方法的参数
        log.info("开始进行数据填充");

        // 获取到当前被拦截的方法上的注解
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();// 获取方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);// 获取注解
        OperationType value = autoFill.value();// 获取注解的值

        // 获取到当前被拦截的方法的实体类
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];// 获取到第一个参数

        // 获准备赋值的值
        Long currentId = BaseContext.getCurrentId();
        LocalDateTime now = LocalDateTime.now();
        //根据反射的方式
        if (value == OperationType.INSERT){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                setUpdateTime.invoke(entity,now);
                setCreateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
                setCreateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (value == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
